Chemistry A-Level
the n+1 rule
What the n+1 rule means in Chemistry A-Level, as defined for AQA.
Definition of the n+1 rule
Check what you remember
Read the wording for your board, then hide it and explain the n+1 rule in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A signal is split into one more line than the number of non-equivalent protons on the neighbouring carbons, limited to doublet, triplet and quartet formation in aliphatic compounds.
Topics that use the n+1 rule
- Nuclear magnetic resonance spectroscopy (A-level only) (AQA A-Level)
Related terms
- assignment from the Data Booklet
- electron-withdrawing neighbours
- from evidence to structure
- independence of field strength
- integration ratios
- shielding and deshielding
- carbon environments
- combining techniques
Using the n+1 rule in the exam
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